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Jan. 31, 1928. 1,657,935

Y J. J. M'JELROY ET AL VIBRATI 0N RECORDING APPARATUS Filed Aug. 14. 1924 3 Sheets-Sheet THEIR ATTORNEY5 Jan. 31, 1928.

J. J. MCELROY ET AL VIBRATION RECORDING APPARATUS Filed Aug. 14. 1924 3 Sheets-Sheet 2 ,1 16mm 979W THEIR ATTORNEYS Jan. 31, 1928.

1,657,935 J. J. M ELROY ET AL VIBRATION RECORDING APPARATUS Filed Aug. 14. 1924 3 Sheets-Sheet 3 THEIR ATTORNEY) atio means but is actuated by 'the vibrations;

Patented Jan. 31, 1928.

UNITED STATES ATENT OFFICE.

JOHN J. MGELROY AND EUGENE L. BEECHER, OF NEW HAVEN, CONNECTICUT, AS- SIGNORS, BY MESNE ASSIGNMENTS, TO THE CLEVELAND PNEUMATIC TOOL COM- PANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

VIBRATION-RECORDING APPARATUS.

Application filed August 14, 1924. Serial No. 731,948.

Our present invention relates to methods and apparatus for the testing of vibrations in various parts of stationary apparatus or of moving vehicles, and for the registering and the recording of the effects of such \ibrations, and the device is applicable for use in the arts generally.

In the device of our im'entionwe employ theinertia of a small mass of considerable weightand the reaction thereof upon the sudden subjection thereof to a force tending to move it ivith' an. acceleratin motion to register the eflects of the acceleration and to actuate mechanism for recording the rel ative values ofj va'rious such forees.

It an object of our invention. to provide means fortrecording the comparative effects of vibrations o f 'difl'erent forces on various parts of bodies' su bjectedtp yibrations such as thef difierent parts of automobile as in the comparati'ye study of the efiicacy of steeL P' neuInatiC, and other springs and cnsl'r-' ions and snubbers, are, as applied to auto-f mobiles. I 1

The furtherjfobject ist provide a com pact portable self-contained an'd'adj ustable recordin instrument forjpermane'ntly re: co rdiri automatically on paper ribbon, ver{ tical accelerations:occurring in a3 vehicle or moving body "exceeding any 'pred eitermined acceleration, so thatth'e nilinber of vibrations so occurring can be fetimted and th e" acicelerj f'any part cular vibrationcanbe deg termin'ed, l M

A further to provide a: means whereby tlie'fpaper ribbon travelis I not de pendent on clockworkorother mechanical thereby conserving the ribbon, alsojztmeans to verifythe total :length of ribbon travel relativeto tili aclciirnulated' intensity oi the vibrations that aii error Lat once cletect zn ,p a

O ther objects of our invention will appear from" the: renewing specification and the drawin'g" -foirning a part thereof, and in hi h .Jlr'. 1 p "zgft I I ig'. l is an elevationalview'of an embodi-. ment of our 'invention fshowing means" for counting" and registering the number of vibrations afi'e'ctin'g said means, meansfor'registering' and recording the effects of vibra-" tions to indicate their relative forces; and

Fig. t is a sectional view along the line iof Fig. 2.

Fig. 5 is a detail view of suspending means of the device of Fig. 2 impart diagram. H V I 1 F ig. 6 is an elevationalview of testing and calibrating appara tusfor the device of Fig. 7 is a detail elvational, View taken substantially on the linej'Z j 7'Figj2.

In the fldrauiing the standardJO mounted on base 11 supports th'e diu ii l' 1291i the spindle -13 through balIliearingsQ Thefdriiin 12 is faced 'circ1iniferei tially;' with or th ckness of 'rubberf'lt "for "the purpose of frictionally e'ngaging'fthe' paper ribbon 16 which is suppliedfnom' the roll wand is d ain t rum by th ispring .17. which is mounted'on th base ll' and'f presses against the circumference of ,said n-1111 12.

h 8ipi et fl ou dfiisaid. ii n? dle 13carriesoiiitsfoiiterend 'oventhe' paper ribbon 16 and "beyondtbe 'cirtfi 'iin ferenfcefof drum '12 a weight l9 "'vvhichfcarries at "its; upper'si de a feeding'pawl2o jvh'iclf extends: downwardly into'cbntacti'yvitli the circu'nifei -f ence of drum '12 isfo'f spring material so that on 'a downward :iiioveniefitftliereof it ps fii' e ysn a e h r 'v t fdr' fi 12 an'd causesjiftftdbe' fro 4 d tlirough an. arc in accordance withthe movement o'fsaid weight 19, 'whil'e on. the: upward ".niovemeiit of. said arm and weiglitiit'islidesbackpver said roller circurnfei'ent be without tending to actuate the latter. j Tlieffsp'fing pawlffzl mounted aboveithe drum and bearing lightly against" the circumfereiice' tli'ei eof allowsiro t'ations of said" drum wlieiiactuated by said pawl 20fbut'acts as a positives topto prevent any return orioppo'site movement of said'drum on its axis? The spring22 rnoiinted abovepin26' on said 'vv e-ightl and in' the line of its movementa'cts as a resilient stop therefor on excessive upwardinovement. The-ratchet revolution counter 23 serves to" record the circumferentialtrave l of'drum 12 41onsaidpostAtl lhe sleeve 14, of heavy and consequcntlr to record the length of paper ribbon n11" between said roller and said spring 17. Said counter i l is held against the circumference of said roller in nieans of'spring 2 1 which is mounted on the frame top and to which is mounted snn' counter 23. The spiral spring iii [ix-rd at one end to standard and at the other to said arm 18 tends to hold said arm 18 and said weight at a normal position between that shown by the full lines and that shown bv the dotted lines.

At the bottom of weight 19 the set. screw 27 holds the needle 28 therein which extends i'lownwardly over said paper rilihnu 1n and when moved on Said arm 19 into contact or proxii'nity with said ribbon is in SllliSlJlH- tially the vertical position. 'lhc liar 23o mounted horizontally on standard 'll serves to 'hold paper ribbon H3 hclwcrn roll 15 and drum 12 taut under said needle 38 and to limit the movement downwardly of said weight 19.

The standard supports the paper roll 15 through spindle 36 and the spring brake 37 pressing'against the edge of said paper roll 15 serves to hold the paper taut as it is drawn from the roll by drum 12. The spring 38' aidsspring'brake 37 inproducing the necessary tension on the paper.

Qne of the vertical posts 10 between base 11 and to p'25-is formed as a smooth rod of uniforn cr ossgsection substantially throughout and-servesijas aguideway for the weight 41 .b oredtoa sliding fit for and mounted on said'post-a Qn said-base 11 is mounted the "push tally counter 42 witli its trigger 43 inthe path of movement of said weight soft r'u bbeudr the like, mounted on and about s 'pos 40, has its upper limitat a. distancelbelmv'tlieiiornaal position of said triggerstjia'to allow theopera'tion of the trig.- geilibb' Said ,Weiglithtl on a downward nio veqip litlthre o'f, andacts as a. butter for said wei'g'ht jon'such liioveinents to prevent er;- cess'i've nioiiernent in'the downward direction afteit'lieja atioh of sai'd'n-i e'r thereby. The spiral Spring 16 mounted loosely about post and fixed at its upper end near the topof'said post and at itslow'er end to said weight 41, serves to suspend said-weight normally atashort distanceabove or in contact-with said trigger 13 when the latter is at its uppermost or normal. position.

The whole apparatus istixed in the vertical position to the 'iiiember 8; which is part of. an laiito inobile body or chassis.

In the use andoperat-ion of the device of Fig 1 for the recording of vibrations set up in agiven part of an automobile or other vehiclesuch. as more axle thereof. or on somepait or the chassis or bod-r the appari tus is uitahty to such. part as to the Part 48'inth'e drawing and the paper ribbon H; from the roll 15 inserted between spring 17 and the friction dru-in 12. Upon the passing of the vehicle over an irregularity in contour of the road or terrain passed over the sudden change in the elevation ofsaid vehicle or part will result in the movementof said weights 19 and t1. with relation to the stationary parts of the apparatus due to the inertia thereof. Considering first the movement of weight 19 as positioned on the hotly of an automobile: As the vehicle passes over its path the weight 19 is vibrated about its axis through short strokes due to slight irregularities in said path :ind'the needle caused to puncture the ribbon 16 which t'rd past said needle. by the drum 1?, which on the down Strokes of weight 19 is moved li said feeding pawl 20. The number of irregularities is recorded by the number of punctures made and their relatiiie distance apart recorded bv the distance ,b'etweensueli punctures. On passing over a. depressionin the oath said weight 19 moves about its axis away from the paper ribbon due to. the. sud.- den fall of the vehicle with its running gear into the depression. Upon the rebloundloi the body with the springs thereoi, weight 19 is throwndownwardlv and the needle makes another puncture in the ribbon, pndtlieup ward movement of feed merge with said weight 19 with respelctjto falling of the vehicle intq th fdepres'sion adds to the feeding strokepf: the downward inovenrenti which {tenets whereby a greater space occurs between the perforation nade in, the papeiyand the nt rious perforationv than o c'curs'ljetyreen pe forations made duringvibrations cansedby the smaller. and more frequentl3 occurring irregularities in the path ofthe vehicle. At

each movement of said 12 by' said pawl 20 the counter 23 is actuated; in turn thcreb causing it. reister. the, circulate;-

enti altrayel" o'fuclruinv meapgfil i by it. Likewise on the striking of ania brnpt rise or buinpin thepathiof eageliicl like dle -28 caused to punetui: he, then. follows a' space liet'wee nssuclifpu nthure and the next. following li yjiil loiig. movement of the needle o Ii: theweight 19, caused bythe reaction iromithebump whic lil results in along feed ot'riliblqnitlirough aid;

pawl 20 and: druni 12 at. the .end ,ai'liibli:

said next follewing puncture is made.

h ann r there, s r et le Q h h i t a series ottpunetures separatgdibyfspaces proportional to the action causetl byji re gu w larities passed over by the vehicle. i l

During theact ion of the ribbon, pnepu'ring register and the, travel counte ht fiy' id,

'glit. l actuated by the saine i rregn; tzcs as net said tally counter 42 i rlijeh,-registers the I 1.; vehicle or such of them as are ate weight 19, Serves 'opeaatggreat enough to be detected through the action of the particular embodiment of inven tion used.

An example of the use of the apparatus of our invention would be a study of the vibrations set up in dili'erent parts of an automobile as for instance those set up in the body thereof and those set up in the chassis. In such a study the apparatus of our invention is fixed to the body of the automobile and a run made over a given road at given speed or speeds. The apparatus is then fixed to the chassis and the same run made the same speeds. The record of the vibrations made in both cases will :dlord a ('(unparat-ive study of vibrations made at the same time or under substantially the same conditions in different parts of the automobile, The study. can also be made by attaching two or more such embodiments of our invention to different parts of the machine and the records of thevibrations occurring in different parts taken at the same time. 21 .5.

In Figs. 2, 3 and .5-of the=drawings is shown. a modification of.the device of our invention inwhich'the'drum- 12 is mounted through roller bearing5 0 on the shaft 51 the ends of which are mounted through ball: bearings-52 and 53 mounted. in recess 54 formed in wall-.i55.'and in the opening 56 formed in the support member 57 respective-' ly, the latter being mountedon block58- formed on said wall 55. Said wall forins part of a casing comprising base 60, wal l"5 5,' posts (SI-and 62,.and top .63. The 'post'61, wall 55, top 63, andbottom- 6O=.are'slotted-to receivegthe thin transparent side'fwall tiii and post-62, wall- 55-, top .63, and bottoiritO are slotted-- to receive: :the' transparent side wall 65. Likewise top 63, posts 61';.:and"62', and bottom;- are slotted-:to receive the thin transparent front: wall 66:" i=T-he {wall 66' is slidably .removablelfor adjustment of the= apparatus, etc. ,='-an'dbeing transparent'per mits inspection thereof. there'through. r The pin 7 (),supports-the.roll 71 of pa er-ta pe 16 which isifed-a-ronnd drum 12, an er;ho'ldii1 springs 72 and 7?. and through longitudina slot 74. and-{through opening 75 in said side \vall 65."-*' j-I'T On either side of the hub which forms part of said shaft 51 are mounted by the rivets 81, 81 the arms 82, 82 which carry between them attheir outer ends the fiat disc shaped weight 83 which carries below its center at its lower limit of movement the projecting needle 84. The said arms 82, 82 carry between them the block 86 which carries the feed pawl 87 which on upward movement of said arms 82 on their pivot or bearings engages the outer rim 14 of said drum 12 which rim is made of resilient material such as rubber. A flexible stop feed pawl 88 1110ll11tl 9 8.9 and r d g over the surface of rim l4 serves to prevent movement of drum 12 in the opposite direction; a I

r The. lower limit of movement of said disc 83 is determined by the projection 90 formed 7 shown as being outside the center of said disc-.with respect to its pivot (See Fig. 7). The purpose of sucha positioning is to overcome any tendency for the-disc to rebound upon its striking said projection 90.

I In said block 931s formed said longitu dinalgroove 74 through which is fed the paper strip 'fronr s aid drum 12.0 18." star fee(ler-. connter=91, operated by the pin mountedonsaid drum .12; iszused .to register the :niiinber of complete: "revolutions of. said dri1m1-12.1'-:Tractional revolutions: ar' measliredzby the scalefiti ondrum- 1 2 and pointer 97?.on :block? 89. Frorn the. number iofrevo IutiOns-Zmade by drnm al 2 the length of paperaltizfcan be computed; -1

:nFixedjtb thefendof saidishaft 51': pro-. jectinglzthrough'arm 57: is a flat'spiralYsprin 100% whiclv'is mounted. about; saidshaft and the puter end of. which .isifixed' to? the inner side of cup 101- .whiCli-has: its: lateral surface knurledifofrhzindlingezZ/Bhe block 102 slidablyzheld: on gsaid=v arfni- 571 by :the:'scre'w 103 which. passes? throughi ithe orizdia'l -slot 104: imasaid bl'ock servesutozrholdasaid: cu iiin: position lnnderwtensionl ofirseiid spring'i'ilfltl' whrrsaidtbloolrr-is, pressed: agaiii'st said cup and saidsemwmos is i tightened; .theisurfa ce: ofifsaid blockucontiguous ito' said cupibeing. duryed to; eonformitheretoz: or iliw "ea-1:51 -a-* ET-hm spring. 1105i mounted abov -said dise 83. vand ionvbloekm106'= -'s'ervesi ito; :oheclri -said: disc *ripomoeirceBsivtgr upward in ovementthBIBOfJ-J: 'J'Jii L J." hil I liz' ii? wWi-thinnsaid blockaalflfi -is:.=' mounted the small-- lectricrlight bulb 107 awhich-eis connected 'idirectlyion C0119 :side to ielectvie eell 108 which is supported on said block 106 by the encircling strap 109. From its other side said lamp is connected to contact 110 (see Fig. 5), mounted on the under side of top 63 near the center thereof. A similar contact 111 is mounted the other side of center from contact 110 and is connected to the other side of the cell 108. The contactor 112 is normally held away from said F g: 4? is shew?! a standard 2 f r suspending, for testing and calibrating purposes, the apparatus 'of'Figs. 2, 3 and 1 by means oi the spring 121 which is connected at its upper end to the arm 123 of said standard and at its lower end to said head 116. In this position the weight of the Vibration recording device causes said contactor 112 to establish electrical connection between said'contacts 110 and 111. Below the recording device and to one side thereof is mounted on the base 121'- of the standard the vertical scale 125 having thereon the adjustable pointer 126.

The use and operation of the device of F'gs. 2, n and 4 are 'the same as above described i'or the device of Fig. 1, the counter 42, and actuating means therefor, of the latter, however, not being contained in the former. In the latter device a greater degree. of accuracy of operation is secured through the use of the disc 83 instead of the rectangular Weight-19 due to the avoidance of shit-ting of the center of gravity upon the radial movement thereof on the respective supporting arm. Int-he device of Figs. 2 to 4 rebound of the Weight is prevented by the dispersing of the reactive force caused by positioning the stop 90 off the vertical projection of thelcenter of said disc 83. Also in the device of Figs. 2 and 4 the drum 12 is actuated and-paper ribb'onalfi'is fed on the upward? movement of disc 83:.Whereby the puncturing? of said ribborn' by needle 84 is performed-while "said ribbon is stationary.

In the calibrationof the device of Fig. 2 it is suspended on the-standardiof Fig. 6

with the-said'spring 121 of a given reactiveforce for a given "distance of: lengthening thereof against tension or from its normal l ength ythisdistance being measured by said scale 125. With a given periodof iecoil of said. springEand-a certain amplitude or move ment from normal upon release of tension the mass will be accelerated afla degree equal to the acceleratioii of gravitv and upon such a positioning andxrelea'se i'co 'ntaetorc112 will drop, -with the consequent de-energization of. said lamp 107. The distance offmovement at the mass necessary to produceacceleration equal 'to that of gravity haiving been deterfnined,- the recording device is set to operate at a given acceleration by repeating the movements and adjusting the tension of spiral spring 100 until upon the required movement said discs 83 will more above the paper strip below sufliciently to feed it a short distance and cause said needle 8% to puncture it.

.Vhat we claim is:

1. In a vibration recording machine, a resiliently suspended weight carrying a piercing needle, a ribbon mounted for travel past the point of said needle and in pierceablo relation therewith, and means for producing such travel actuated by the movement of said weight. and proportional to the amount of such movement.

2. In a vibration-recording device, a weight suspended resiliently to allow actuation thereof by forces whose vibrations are recorded, means actuated by said weight for recording the effects otmovement of said weight on its resilient suspension and means actuated by the movement of said Weight upon its resilient suspension to move said oriaik -receiving means.

3. In a recordingdevice, a' resiliently suspended weight, marking means carried b saidm 'eight, means for receivingmarks from said mar-king means upon movement thereof with said Weight on its-resilienlis'uspension andtm'cansaotuated by the 'movement of said weight upon its resilient suspension to move saidfima'n'k receiving means.

4:." In"a:Wibration-recording device, a resi'lienftly suspended "Weight, marking means carried by said Weight, means for receiving marks made by. said marking means and in operable relation therewith, and means actuated. by thmovement of said weight upon its'resilient suspension to move said -'l narkreceiivingmean 1 4 5. In a vibrationwec'ording device having a resiliently supported weight-for'receiving and transmitting--vibration"effects, a stop for I said we ght positioned oi the projection of 'tlieeenterof gravity of said'weigh t in the direction of the 'I'novement thereons'i rn'aturesq" JOHNJ;'IVICELROYJ' (I 

